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https://www.kernel.org/doc/html/latest/driver-api/dmaengine/client.html
This returns a cookie can be used to check the progress of DMA engine activity via other DMA engine calls not covered in this document. dmaengine_submit() will not start the DMA operation, it merely adds it to the pending queue. For this, see step 5, dma_async_issue_pending.
https://www.kernel.org/doc/html/latest/driver-api/dmaengine/dmatest.html
Device Drivers -> DMA Engine support -> DMA Test client In the configuration file the option called CONFIG_DMATEST. The dmatest could be built as module or inside kernel. Let’s consider those cases.
https://lwn.net/Articles/520351/
Changes since v2: - Rebased on 3.7-rc1 - Fixed bug in DT/pdata parsing first found by Gururaja that turned out to be masked by some toolchains - Dropped unused mach-omap2/devices.c hsmmc patch - Added AM33XX crossbar DMA event mux support - Added am335x-evm support Changes since v1: - Rebased on top of mainline from 12250d8 - Dropped the feature removal schedule patch - Implemented dma…
https://lwn.net/Articles/535153/
Changes since v5: - Dropped mmc portion and moved it to a separate series - Incorporate corrected version of dma_request_slave_channel_compat() - Fix #defines and enablement of TI_PRIV_EDMA option Changes since v4: - Fixed debug section mismatch in private edma api [01/14] - Respun format-patch to catch the platform_data/edma.h rename [01/14] - Removed address/size-cells from the …
https://www.kernel.org/doc/html/v4.15/driver-api/dmaengine/dmatest.html
Device Drivers -> DMA Engine support -> DMA Test client In the configuration file the option called CONFIG_DMATEST. The dmatest could be built as module or inside kernel. Let’s consider those cases.
https://patchwork.kernel.org/patch/11315249/
This DMA engine which is an PCIe iEP offers 30 channels, each channel has a send queue, a complete queue and an interrupt to help to do tasks. This DMA engine can do memory copy between memory blocks or between memory and device buffer.
https://lkml.org/lkml/2019/9/24/74
https://en.wikipedia.org/wiki/Direct_memory_access
DMA can also be used for "memory to memory" copying or moving of data within memory. DMA can offload expensive memory operations, such as large copies or scatter-gather operations, from the CPU to a dedicated DMA engine. An implementation example is the I/O Acceleration Technology.
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