[EMAIL PROTECTED] wrote: > Waaay back in October I sent some patches for passing additional > attributes to the dma_map_* routines: > > http://marc.info/?l=linux-kernel&m=119137949604365&w=2
Do I understand correctly?: A device and the CPUs communicate via two separate memory areas: A data buffer and a status FIFO. The NUMA interconnect may reorder accesses of the device to the areas. (Write accesses? Read accesses? Both?) To ensure synchronization between device and CPUs, you want to mark a memory area which is to be dma-mapped with a flag which says: "Writes to the memory region will cause in-flight DMA to be flushed". Whose writes? A write access from the device or a write access from a CPU? -- Stefan Richter -=====-=-=== ==-- =--=- http://arcgraph.de/sr/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
