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SubjectRe: Can I/OAT DMA engineer access PCI MMIO space

>> yes, I had used 'ioremap_nocache' to map the IO memory and I can use
>> memcpy to copy data to this region. The async_tx should have been
>> correctly configured as
>> I can use aync_memcpy to copy data between different system memory address.
> Then you should be using memcpy_toio() and friends
Do you mean that if I have mapped the mmio, I can' use I/OAT dma
transfer to this region any more?
I can use memcpy to copy data, but it consumes lots of cpu as PCI access
is too slow.
If I can use i/oat dma and asyc_tx api to do the job, the performance
should be imporved.

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