1What: /sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/cap 2Date: December 3, 2009 3KernelVersion: 2.6.32 4Contact: dmaengine@vger.kernel.org 5Description: Capabilities the DMA supports.Currently there are DMA_PQ, DMA_PQ_VAL, 6 DMA_XOR,DMA_XOR_VAL,DMA_INTERRUPT. 7 8What: /sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/ring_active 9Date: December 3, 2009 10KernelVersion: 2.6.32 11Contact: dmaengine@vger.kernel.org 12Description: The number of descriptors active in the ring. 13 14What: /sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/ring_size 15Date: December 3, 2009 16KernelVersion: 2.6.32 17Contact: dmaengine@vger.kernel.org 18Description: Descriptor ring size, total number of descriptors available. 19 20What: /sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/version 21Date: December 3, 2009 22KernelVersion: 2.6.32 23Contact: dmaengine@vger.kernel.org 24Description: Version of ioatdma device. 25 26What: /sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/intr_coalesce 27Date: August 8, 2017 28KernelVersion: 4.14 29Contact: dmaengine@vger.kernel.org 30Description: Tune-able interrupt delay value per channel basis. 31