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https://www.kernel.org/doc/html/latest/driver-api/pci/p2pdma.html
PCI Peer-to-Peer DMA Support¶ The PCI bus has pretty decent support for performing DMA transfers between two devices on the bus. This type of transaction is henceforth called Peer-to-Peer (or P2P). However, there are a number of issues that make P2P transactions tricky to do in a perfectly safe way.
https://www.kernel.org/doc/html/v4.19/driver-api/dmaengine/provider.html
DMA Support in Linux¶ Historically, DMA controller drivers have been implemented using the async TX API, to offload operations such as memory copy, XOR, cryptography, etc., basically any memory to memory operation. Over time, the need for memory to device …
https://www.oreilly.com/library/view/linux-device-drivers/0596005903/ch15.html
Chapter 15. Memory Mapping and DMA This chapter delves into the area of Linux memory management, with an emphasis on techniques that are useful to the device driver writer. Many … - Selection from Linux Device Drivers, 3rd Edition [Book]
https://wiki.analog.com/resources/tools-software/linux-drivers/axi-dmac
The AXI DMAC is a high-speed, high-throughput, general purpose DMA controller intended to be used to transfer data between system memory and other peripherals like high-speed converters.
https://www.ibm.com/support/knowledgecenter/en/linuxonibm/liabm/liabmconcepts.htm
On new IBM Power Systems servers running Linux, a set of the PCIe slots support a unique feature called 64-bit direct memory access (DMA). DMA improves …
https://www.oreilly.com/library/view/linux-device-drivers/0596000081/ch13s04.html
Direct Memory Access and Bus Mastering Direct memory access, or DMA, is the advanced topic that completes our overview of memory issues. DMA is the hardware mechanism that allows peripheral … - Selection from Linux Device Drivers, Second Edition [Book]
https://www.xml.com/ldd/chapter/book/ch13.html
Direct Memory Access and Bus Mastering. Direct memory access, or DMA, is the advanced topic that completes our overview of memory issues. DMA is the hardware mechanism that allows peripheral components to transfer their I/O data directly to and from main memory without the need for the system processor to be involved in the transfer.
https://unix.stackexchange.com/questions/241978/what-is-proc-dma-is-it-just-for-legacy-support
The ISA dma controller is still included on any system that has an ISA bus, which your typical desktop system still has these days, mostly to support floppy disk and IDE disk controllers ( which AHCI SATA controllers can still emulate for backward software compatibility ).
https://www.toradex.com/community/questions/1961/vf61-linux-spi-dma-support.html
VF61 Linux SPI DMA support. spi-fsl-dspi driver does not supports DMA. I made some driver modification for DMA support. After code test I got next result. DMA transmit is ok. DMA receives about 50% of lost packets (some parts of buffer contents previous message). The issue is in DMA. Not all data are copied from device fifo into memory.
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