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CONFIG_PCI_P2PDMA: PCI peer-to-peer transfer support

General informations

The Linux kernel configuration item CONFIG_PCI_P2PDMA:

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Enableѕ drivers to do PCI peer-to-peer transactions to and from BARs that are exposed in other devices that are the part of the hierarchy where peer-to-peer DMA is guaranteed by the PCI specification to work (ie. anything below a single PCI bridge).

Many PCIe root complexes do not support P2P transactions and it's hard to tell which support it at all, so at this time, P2P DMA transations must be between devices behind the same root port.

If unsure, say N.

Hardware

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