# SPDX-License-Identifier: GPL-2.0-only # # DMA engine configuration # menuconfig DMADEVICES bool "DMA Engine support" depends on HAS_DMA help DMA engines can do asynchronous data transfers without involving the host CPU. Currently, this framework can be used to offload memory copies in the network stack and RAID operations in the MD driver. This menu only presents DMA Device drivers supported by the configured arch, it may be empty in some cases. config DMADEVICES_DEBUG bool "DMA Engine debugging" depends on DMADEVICES != n help This is an option for use by developers; most people should say N here. This enables DMA engine core and driver debugging. config DMADEVICES_VDEBUG bool "DMA Engine verbose debugging" depends on DMADEVICES_DEBUG != n help This is an option for use by developers; most people should say N here. This enables deeper (more verbose) debugging of the DMA engine core and drivers. if DMADEVICES comment "DMA Devices" #core config ASYNC_TX_ENABLE_CHANNEL_SWITCH bool config ARCH_HAS_ASYNC_TX_FIND_CHANNEL bool config DMA_ENGINE bool config DMA_VIRTUAL_CHANNELS tristate config DMA_ACPI def_bool y depends on ACPI config DMA_OF def_bool y depends on OF select DMA_ENGINE #devices config ALTERA_MSGDMA tristate "Altera / Intel mSGDMA Engine" depends on HAS_IOMEM select DMA_ENGINE help Enable support for Altera / Intel mSGDMA controller. config AMBA_PL08X bool "ARM PrimeCell PL080 or PL081 support" depends on ARM_AMBA select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Say yes if your platform has a PL08x DMAC device which can provide DMA engine support. This includes the original ARM PL080 and PL081, Samsungs PL080 derivative and Faraday Technology's FTDMAC020 PL080 derivative. config AMCC_PPC440SPE_ADMA tristate "AMCC PPC440SPe ADMA support" depends on 440SPe || 440SP select DMA_ENGINE select DMA_ENGINE_RAID select ARCH_HAS_ASYNC_TX_FIND_CHANNEL select ASYNC_TX_ENABLE_CHANNEL_SWITCH help Enable support for the AMCC PPC440SPe RAID engines. config APPLE_ADMAC tristate "Apple ADMAC support" depends on ARCH_APPLE || COMPILE_TEST select DMA_ENGINE default ARCH_APPLE help Enable support for Audio DMA Controller found on Apple Silicon SoCs. config AT_HDMAC tristate "Atmel AHB DMA support" depends on ARCH_AT91 select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Support the Atmel AHB DMA controller. config AT_XDMAC tristate "Atmel XDMA support" depends on ARCH_AT91 select DMA_ENGINE help Support the Atmel XDMA controller. config AXI_DMAC tristate "Analog Devices AXI-DMAC DMA support" depends on MICROBLAZE || NIOS2 || ARCH_ZYNQ || ARCH_ZYNQMP || ARCH_INTEL_SOCFPGA || COMPILE_TEST select DMA_ENGINE select DMA_VIRTUAL_CHANNELS select REGMAP_MMIO help Enable support for the Analog Devices AXI-DMAC peripheral. This DMA controller is often used in Analog Devices' reference designs for FPGA platforms. config BCM_SBA_RAID tristate "Broadcom SBA RAID engine support" depends on ARM64 || COMPILE_TEST depends on MAILBOX && RAID6_PQ select DMA_ENGINE select DMA_ENGINE_RAID select ASYNC_TX_DISABLE_XOR_VAL_DMA select ASYNC_TX_DISABLE_PQ_VAL_DMA default m if ARCH_BCM_IPROC help Enable support for Broadcom SBA RAID Engine. The SBA RAID engine is available on most of the Broadcom iProc SoCs. It has the capability to offload memcpy, xor and pq computation for raid5/6. config DMA_BCM2835 tristate "BCM2835 DMA engine support" depends on ARCH_BCM2835 select DMA_ENGINE select DMA_VIRTUAL_CHANNELS config DMA_JZ4780 tristate "JZ4780 DMA support" depends on MIPS || COMPILE_TEST select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help This selects support for the DMA controller in Ingenic JZ4780 SoCs. If you have a board based on such a SoC and wish to use DMA for devices which can use the DMA controller, say Y or M here. config DMA_SA11X0 tristate "SA-11x0 DMA support" depends on ARCH_SA1100 || COMPILE_TEST select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Support the DMA engine found on Intel StrongARM SA-1100 and SA-1110 SoCs. This DMA engine can only be used with on-chip devices. config DMA_SUN4I tristate "Allwinner A10 DMA SoCs support" depends on MACH_SUN4I || MACH_SUN5I || MACH_SUN7I default (MACH_SUN4I || MACH_SUN5I || MACH_SUN7I) select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Enable support for the DMA controller present in the sun4i, sun5i and sun7i Allwinner ARM SoCs. config DMA_SUN6I tristate "Allwinner A31 SoCs DMA support" depends on ARCH_SUNXI || COMPILE_TEST depends on RESET_CONTROLLER select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Support for the DMA engine first found in Allwinner A31 SoCs. config DW_AXI_DMAC tristate "Synopsys DesignWare AXI DMA support" depends on OF depends on HAS_IOMEM select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Enable support for Synopsys DesignWare AXI DMA controller. NOTE: This driver wasn't tested on 64 bit platform because of lack 64 bit platform with Synopsys DW AXI DMAC. config EP93XX_DMA bool "Cirrus Logic EP93xx DMA support" depends on ARCH_EP93XX || COMPILE_TEST select DMA_ENGINE help Enable support for the Cirrus Logic EP93xx M2P/M2M DMA controller. config FSL_DMA tristate "Freescale Elo series DMA support" depends on FSL_SOC select DMA_ENGINE select ASYNC_TX_ENABLE_CHANNEL_SWITCH help Enable support for the Freescale Elo series DMA controllers. The Elo is the DMA controller on some mpc82xx and mpc83xx parts, the EloPlus is on mpc85xx and mpc86xx and Pxxx parts, and the Elo3 is on some Txxx and Bxxx parts. config FSL_EDMA tristate "Freescale eDMA engine support" depends on OF depends on HAS_IOMEM select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Support the Freescale eDMA engine with programmable channel multiplexing capability for DMA request sources(slot). This module can be found on Freescale Vybrid and LS-1 SoCs. config FSL_QDMA tristate "NXP Layerscape qDMA engine support" depends on ARM || ARM64 select DMA_ENGINE select DMA_VIRTUAL_CHANNELS select DMA_ENGINE_RAID select ASYNC_TX_ENABLE_CHANNEL_SWITCH help Support the NXP Layerscape qDMA engine with command queue and legacy mode. Channel virtualization is supported through enqueuing of DMA jobs to, or dequeuing DMA jobs from, different work queues. This module can be found on NXP Layerscape SoCs. The qdma driver only work on SoCs with a DPAA hardware block. config FSL_RAID tristate "Freescale RAID engine Support" depends on FSL_SOC && !ASYNC_TX_ENABLE_CHANNEL_SWITCH select DMA_ENGINE select DMA_ENGINE_RAID help Enable support for Freescale RAID Engine. RAID Engine is available on some QorIQ SoCs (like P5020/P5040). It has the capability to offload memcpy, xor and pq computation for raid5/6. config HISI_DMA tristate "HiSilicon DMA Engine support" depends on ARCH_HISI || COMPILE_TEST depends on PCI_MSI select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Support HiSilicon Kunpeng DMA engine. config IMG_MDC_DMA tristate "IMG MDC support" depends on MIPS || COMPILE_TEST depends on MFD_SYSCON select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Enable support for the IMG multi-threaded DMA controller (MDC). config IMX_DMA tristate "i.MX DMA support" depends on ARCH_MXC select DMA_ENGINE help Support the i.MX DMA engine. This engine is integrated into Freescale i.MX1/21/27 chips. config IMX_SDMA tristate "i.MX SDMA support" depends on ARCH_MXC select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Support the i.MX SDMA engine. This engine is integrated into Freescale i.MX25/31/35/51/53/6 chips. config INTEL_IDMA64 tristate "Intel integrated DMA 64-bit support" depends on HAS_IOMEM select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Enable DMA support for Intel Low Power Subsystem such as found on Intel Skylake PCH. config INTEL_IDXD_BUS tristate default INTEL_IDXD config INTEL_IDXD tristate "Intel Data Accelerators support" depends on PCI && X86_64 && !UML depends on PCI_MSI depends on PCI_PASID depends on SBITMAP select DMA_ENGINE help Enable support for the Intel(R) data accelerators present in Intel Xeon CPU. Say Y if you have such a platform. If unsure, say N. config INTEL_IDXD_COMPAT bool "Legacy behavior for idxd driver" depends on PCI && X86_64 select INTEL_IDXD_BUS help Compatible driver to support old /sys/bus/dsa/drivers/dsa behavior. The old behavior performed driver bind/unbind for device and wq devices all under the dsa driver. The compat driver will emulate the legacy behavior in order to allow existing support apps (i.e. accel-config) to continue function. It is expected that accel-config v3.2 and earlier will need the compat mode. A distro with later accel-config version can disable this compat config. Say Y if you have old applications that require such behavior. If unsure, say N. # Config symbol that collects all the dependencies that's necessary to # support shared virtual memory for the devices supported by idxd. config INTEL_IDXD_SVM bool "Accelerator Shared Virtual Memory Support" depends on INTEL_IDXD depends on INTEL_IOMMU_SVM depends on PCI_PRI depends on PCI_PASID depends on PCI_IOV config INTEL_IDXD_PERFMON bool "Intel Data Accelerators performance monitor support" depends on INTEL_IDXD help Enable performance monitor (pmu) support for the Intel(R) data accelerators present in Intel Xeon CPU. With this enabled, perf can be used to monitor the DSA (Intel Data Streaming Accelerator) events described in the Intel DSA spec. If unsure, say N. config INTEL_IOATDMA tristate "Intel I/OAT DMA support" depends on PCI && X86_64 && !UML select DMA_ENGINE select DMA_ENGINE_RAID select DCA help Enable support for the Intel(R) I/OAT DMA engine present in recent Intel Xeon chipsets. Say Y here if you have such a chipset. If unsure, say N. config K3_DMA tristate "Hisilicon K3 DMA support" depends on ARCH_HISI || COMPILE_TEST select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Support the DMA engine for Hisilicon K3 platform devices. config LPC18XX_DMAMUX bool "NXP LPC18xx/43xx DMA MUX for PL080" depends on ARCH_LPC18XX || COMPILE_TEST depends on OF && AMBA_PL08X select MFD_SYSCON help Enable support for DMA on NXP LPC18xx/43xx platforms with PL080 and multiplexed DMA request lines. config LS2X_APB_DMA tristate "Loongson LS2X APB DMA support" depends on LOONGARCH || COMPILE_TEST select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Support for the Loongson LS2X APB DMA controller driver. The DMA controller is having single DMA channel which can be configured for different peripherals like audio, nand, sdio etc which is in APB bus. This DMA controller transfers data from memory to peripheral fifo. It does not support memory to memory data transfer. config MCF_EDMA tristate "Freescale eDMA engine support, ColdFire mcf5441x SoCs" depends on M5441x || COMPILE_TEST select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Support the Freescale ColdFire eDMA engine, 64-channel implementation that performs complex data transfers with minimal intervention from a host processor. This module can be found on Freescale ColdFire mcf5441x SoCs. config MILBEAUT_HDMAC tristate "Milbeaut AHB DMA support" depends on ARCH_MILBEAUT || COMPILE_TEST depends on OF select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Say yes here to support the Socionext Milbeaut HDMAC device. config MILBEAUT_XDMAC tristate "Milbeaut AXI DMA support" depends on ARCH_MILBEAUT || COMPILE_TEST depends on OF select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Say yes here to support the Socionext Milbeaut XDMAC device. config MMP_PDMA tristate "MMP PDMA support" depends on ARCH_MMP || ARCH_PXA || COMPILE_TEST select DMA_ENGINE help Support the MMP PDMA engine for PXA and MMP platform. config MMP_TDMA tristate "MMP Two-Channel DMA support" depends on ARCH_MMP || COMPILE_TEST select DMA_ENGINE select GENERIC_ALLOCATOR help Support the MMP Two-Channel DMA engine. This engine used for MMP Audio DMA and pxa910 SQU. config MOXART_DMA tristate "MOXART DMA support" depends on ARCH_MOXART select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Enable support for the MOXA ART SoC DMA controller. Say Y here if you enabled MMP ADMA, otherwise say N. config MPC512X_DMA tristate "Freescale MPC512x built-in DMA engine support" depends on PPC_MPC512x || PPC_MPC831x select DMA_ENGINE help Enable support for the Freescale MPC512x built-in DMA engine. config MV_XOR bool "Marvell XOR engine support" depends on PLAT_ORION || ARCH_MVEBU || COMPILE_TEST select DMA_ENGINE select DMA_ENGINE_RAID select ASYNC_TX_ENABLE_CHANNEL_SWITCH help Enable support for the Marvell XOR engine. config MV_XOR_V2 bool "Marvell XOR engine version 2 support " depends on ARM64 select DMA_ENGINE select DMA_ENGINE_RAID select ASYNC_TX_ENABLE_CHANNEL_SWITCH select GENERIC_MSI_IRQ help Enable support for the Marvell version 2 XOR engine. This engine provides acceleration for copy, XOR and RAID6 operations, and is available on Marvell Armada 7K and 8K platforms. config MXS_DMA bool "MXS DMA support" depends on ARCH_MXS || ARCH_MXC || COMPILE_TEST select STMP_DEVICE select DMA_ENGINE help Support the MXS DMA engine. This engine including APBH-DMA and APBX-DMA is integrated into some Freescale chips. config NBPFAXI_DMA tristate "Renesas Type-AXI NBPF DMA support" select DMA_ENGINE depends on ARM || COMPILE_TEST help Support for "Type-AXI" NBPF DMA IPs from Renesas config OWL_DMA tristate "Actions Semi Owl SoCs DMA support" depends on ARCH_ACTIONS select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Enable support for the Actions Semi Owl SoCs DMA controller. config PCH_DMA tristate "Intel EG20T PCH / LAPIS Semicon IOH(ML7213/ML7223/ML7831) DMA" depends on PCI && (X86_32 || COMPILE_TEST) select DMA_ENGINE help Enable support for Intel EG20T PCH DMA engine. This driver also can be used for LAPIS Semiconductor IOH(Input/ Output Hub), ML7213, ML7223 and ML7831. ML7213 IOH is for IVI(In-Vehicle Infotainment) use, ML7223 IOH is for MP(Media Phone) use and ML7831 IOH is for general purpose use. ML7213/ML7223/ML7831 is companion chip for Intel Atom E6xx series. ML7213/ML7223/ML7831 is completely compatible for Intel EG20T PCH. config PL330_DMA tristate "DMA API Driver for PL330" select DMA_ENGINE depends on ARM_AMBA help Select if your platform has one or more PL330 DMACs. You need to provide platform specific settings via platform_data for a dma-pl330 device. config PXA_DMA bool "PXA DMA support" depends on (ARCH_MMP || ARCH_PXA) select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Support the DMA engine for PXA. It is also compatible with MMP PDMA platform. The internal DMA IP of all PXA variants is supported, with 16 to 32 channels for peripheral to memory or memory to memory transfers. config PLX_DMA tristate "PLX ExpressLane PEX Switch DMA Engine Support" depends on PCI select DMA_ENGINE help Some PLX ExpressLane PCI Switches support additional DMA engines. These are exposed via extra functions on the switch's upstream port. Each function exposes one DMA channel. config STE_DMA40 bool "ST-Ericsson DMA40 support" depends on ARCH_U8500 select DMA_ENGINE select SRAM help Support for ST-Ericsson DMA40 controller config ST_FDMA tristate "ST FDMA dmaengine support" depends on ARCH_STI depends on REMOTEPROC select ST_SLIM_REMOTEPROC select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Enable support for ST FDMA controller. It supports 16 independent DMA channels, accepts up to 32 DMA requests Say Y here if you have such a chipset. If unsure, say N. config STM32_DMA bool "STMicroelectronics STM32 DMA support" depends on ARCH_STM32 || COMPILE_TEST select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Enable support for the on-chip DMA controller on STMicroelectronics STM32 MCUs. If you have a board based on such a MCU and wish to use DMA say Y here. config STM32_DMAMUX bool "STMicroelectronics STM32 dma multiplexer support" depends on STM32_DMA || COMPILE_TEST help Enable support for the on-chip DMA multiplexer on STMicroelectronics STM32 MCUs. If you have a board based on such a MCU and wish to use DMAMUX say Y here. config STM32_MDMA bool "STMicroelectronics STM32 master dma support" depends on ARCH_STM32 || COMPILE_TEST depends on OF select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Enable support for the on-chip MDMA controller on STMicroelectronics STM32 platforms. If you have a board based on STM32 SoC and wish to use the master DMA say Y here. config SPRD_DMA tristate "Spreadtrum DMA support" depends on ARCH_SPRD || COMPILE_TEST select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Enable support for the on-chip DMA controller on Spreadtrum platform. config TXX9_DMAC tristate "Toshiba TXx9 SoC DMA support" depends on MACH_TX49XX select DMA_ENGINE help Support the TXx9 SoC internal DMA controller. This can be integrated in chips such as the Toshiba TX4927/38/39. config TEGRA186_GPC_DMA tristate "NVIDIA Tegra GPC DMA support" depends on (ARCH_TEGRA || COMPILE_TEST) && ARCH_DMA_ADDR_T_64BIT depends on IOMMU_API select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Support for the NVIDIA Tegra General Purpose Central DMA controller. The DMA controller has multiple DMA channels which can be configured for different peripherals like UART, SPI, etc which are on APB bus. This DMA controller transfers data from memory to peripheral FIFO or vice versa. It also supports memory to memory data transfer. config TEGRA20_APB_DMA tristate "NVIDIA Tegra20 APB DMA support" depends on ARCH_TEGRA || COMPILE_TEST select DMA_ENGINE help Support for the NVIDIA Tegra20 APB DMA controller driver. The DMA controller is having multiple DMA channel which can be configured for different peripherals like audio, UART, SPI, I2C etc which is in APB bus. This DMA controller transfers data from memory to peripheral fifo or vice versa. It does not support memory to memory data transfer. config TEGRA210_ADMA tristate "NVIDIA Tegra210 ADMA support" depends on (ARCH_TEGRA || COMPILE_TEST) select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Support for the NVIDIA Tegra210/Tegra186/Tegra194/Tegra234 ADMA controller driver. The DMA controller has multiple DMA channels and is used to service various audio clients in the Tegra210 audio processing engine (APE). This DMA controller transfers data from memory to peripheral and vice versa. It does not support memory to memory data transfer. config TIMB_DMA tristate "Timberdale FPGA DMA support" depends on MFD_TIMBERDALE || COMPILE_TEST select DMA_ENGINE help Enable support for the Timberdale FPGA DMA engine. config UNIPHIER_MDMAC tristate "UniPhier MIO DMAC" depends on ARCH_UNIPHIER || COMPILE_TEST depends on OF select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Enable support for the MIO DMAC (Media I/O DMA controller) on the UniPhier platform. This DMA controller is used as the external DMA engine of the SD/eMMC controllers of the LD4, Pro4, sLD8 SoCs. config UNIPHIER_XDMAC tristate "UniPhier XDMAC support" depends on ARCH_UNIPHIER || COMPILE_TEST depends on OF select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Enable support for the XDMAC (external DMA controller) on the UniPhier platform. This DMA controller can transfer data from memory to memory, memory to peripheral and peripheral to memory. config XGENE_DMA tristate "APM X-Gene DMA support" depends on ARCH_XGENE || COMPILE_TEST select DMA_ENGINE select DMA_ENGINE_RAID select ASYNC_TX_ENABLE_CHANNEL_SWITCH help Enable support for the APM X-Gene SoC DMA engine. config XILINX_DMA tristate "Xilinx AXI DMAS Engine" depends on HAS_IOMEM select DMA_ENGINE help Enable support for Xilinx AXI VDMA Soft IP. AXI VDMA engine provides high-bandwidth direct memory access between memory and AXI4-Stream video type target peripherals including peripherals which support AXI4- Stream Video Protocol. It has two stream interfaces/ channels, Memory Mapped to Stream (MM2S) and Stream to Memory Mapped (S2MM) for the data transfers. AXI CDMA engine provides high-bandwidth direct memory access between a memory-mapped source address and a memory-mapped destination address. AXI DMA engine provides high-bandwidth one dimensional direct memory access between memory and AXI4-Stream target peripherals. AXI MCDMA engine provides high-bandwidth direct memory access between memory and AXI4-Stream target peripherals. It provides the scatter gather interface with multiple channels independent configuration support. config XILINX_XDMA tristate "Xilinx DMA/Bridge Subsystem DMA Engine" depends on HAS_IOMEM select DMA_ENGINE select DMA_VIRTUAL_CHANNELS select REGMAP_MMIO help Enable support for Xilinx DMA/Bridge Subsystem DMA engine. The DMA provides high performance block data movement between Host memory and the DMA subsystem. These direct memory transfers can be both in the Host to Card (H2C) and Card to Host (C2H) transfers. The core also provides up to 16 user interrupt wires that generate interrupts to the host. config XILINX_ZYNQMP_DMA tristate "Xilinx ZynqMP DMA Engine" depends on ARCH_ZYNQ || MICROBLAZE || ARM64 || COMPILE_TEST select DMA_ENGINE help Enable support for Xilinx ZynqMP DMA controller. config XILINX_ZYNQMP_DPDMA tristate "Xilinx DPDMA Engine" depends on HAS_IOMEM && OF select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help Enable support for Xilinx ZynqMP DisplayPort DMA. Choose this option if you have a Xilinx ZynqMP SoC with a DisplayPort subsystem. The driver provides the dmaengine required by the DisplayPort subsystem display driver. # driver files source "drivers/dma/bestcomm/Kconfig" source "drivers/dma/mediatek/Kconfig" source "drivers/dma/ptdma/Kconfig" source "drivers/dma/qcom/Kconfig" source "drivers/dma/dw/Kconfig" source "drivers/dma/dw-edma/Kconfig" source "drivers/dma/hsu/Kconfig" source "drivers/dma/sf-pdma/Kconfig" source "drivers/dma/sh/Kconfig" source "drivers/dma/ti/Kconfig" source "drivers/dma/fsl-dpaa2-qdma/Kconfig" source "drivers/dma/lgm/Kconfig" # clients comment "DMA Clients" depends on DMA_ENGINE config ASYNC_TX_DMA bool "Async_tx: Offload support for the async_tx api" depends on DMA_ENGINE help This allows the async_tx api to take advantage of offload engines for memcpy, memset, xor, and raid6 p+q operations. If your platform has a dma engine that can perform raid operations and you have enabled MD_RAID456 say Y. If unsure, say N. config DMATEST tristate "DMA Test client" depends on DMA_ENGINE select DMA_ENGINE_RAID help Simple DMA test client. Say N unless you're debugging a DMA Device driver. config DMA_ENGINE_RAID bool endif