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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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The XOR engine found in Marvell's SoCs and system controllers provides XOR and DMA operation, iSCSI CRC32C calculation, memory initialization, and memory ECC error cleanup operation support. This driver implements the DMA engine API and supports the following capabilities: - memcpy - xor - memset The XOR engine can be used by DMA engine clients implemented in the kernel, one of those clients is the RAID module. In that case, I observed 20% improvement in the raid5 write throughput, and 40% decrease in the CPU utilization when doing array construction, those results obtained on an 5182 running at 500Mhz. When enabling the NET DMA client, the performance decreased, so meanwhile it is recommended to keep this client off. Signed-off-by: Saeed Bishara <saeed@marvell.com> Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: Nicolas Pitre <nico@marvell.com> Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
76 lines
1.8 KiB
Plaintext
76 lines
1.8 KiB
Plaintext
#
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# DMA engine configuration
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#
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menuconfig DMADEVICES
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bool "DMA Engine support"
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depends on !HIGHMEM64G && HAS_DMA
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help
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DMA engines can do asynchronous data transfers without
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involving the host CPU. Currently, this framework can be
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used to offload memory copies in the network stack and
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RAID operations in the MD driver. This menu only presents
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DMA Device drivers supported by the configured arch, it may
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be empty in some cases.
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if DMADEVICES
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comment "DMA Devices"
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config INTEL_IOATDMA
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tristate "Intel I/OAT DMA support"
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depends on PCI && X86
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select DMA_ENGINE
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select DCA
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help
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Enable support for the Intel(R) I/OAT DMA engine present
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in recent Intel Xeon chipsets.
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Say Y here if you have such a chipset.
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If unsure, say N.
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config INTEL_IOP_ADMA
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tristate "Intel IOP ADMA support"
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depends on ARCH_IOP32X || ARCH_IOP33X || ARCH_IOP13XX
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select ASYNC_CORE
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select DMA_ENGINE
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help
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Enable support for the Intel(R) IOP Series RAID engines.
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config FSL_DMA
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bool "Freescale MPC85xx/MPC83xx DMA support"
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depends on PPC
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select DMA_ENGINE
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---help---
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Enable support for the Freescale DMA engine. Now, it support
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MPC8560/40, MPC8555, MPC8548 and MPC8641 processors.
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The MPC8349, MPC8360 is also supported.
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config MV_XOR
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bool "Marvell XOR engine support"
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depends on PLAT_ORION
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select ASYNC_CORE
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select DMA_ENGINE
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---help---
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Enable support for the Marvell XOR engine.
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config DMA_ENGINE
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bool
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comment "DMA Clients"
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depends on DMA_ENGINE
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config NET_DMA
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bool "Network: TCP receive copy offload"
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depends on DMA_ENGINE && NET
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default (INTEL_IOATDMA || FSL_DMA)
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help
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This enables the use of DMA engines in the network stack to
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offload receive copy-to-user operations, freeing CPU cycles.
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Say Y here if you enabled INTEL_IOATDMA or FSL_DMA, otherwise
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say N.
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endif
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