CONFIG_AMD_PTDMA is not available for the default architecture x86.
Result is shown for architecture 64BIT

AMD PassThru DMA Engine

modulename: ptdma.ko
configname: CONFIG_AMD_PTDMA

Linux Kernel Configuration
└─> Device Drivers
└─> DMA Engine support
└─> PCI support
└─> AMD PassThru DMA Engine

Enable support for the AMD PTDMA controller. This controller
provides DMA capabilities to perform high bandwidth memory to
memory and IO copy operations. It performs DMA transfer through
queue-based descriptor management. This DMA controller is intended
to be used with AMD Non-Transparent Bridge devices and not for
general purpose peripheral DMA.

source code: