tIOPCIAccessOptions
Declaration
typedef enum tIOPCIAccessOptions : unsigned int { ... } tIOPCIAccessOptions;Overview
Options passed to memory space accessor functions
and host software is permitted to offload the access to a DMA engine in order to free the CPU for other work to
optimize overall system performance. Use of this hint may increase the latency of the memory space accessor function. if such a mapping is available. Care must be taken to ensure correct ordering of PCIe accesses (i.e., with memory barriers):
1. Ordering between WC accesses to different addresses is not guaranteed.
2. Ordering between WC and non-WC accesses is not guaranteed.
3. To guarantee a write has been issued to the endpoint, a barrier is required.