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

[Koul, Vinod]

On Fri, 2011-04-29 at 18:13 +0800, ååæ wrote:
> I try to use ioatdam to copy data from system memory to pci MMIO space:

> If dst points to a memory space, the operation would pass.
> But if dst points to a pci MMIO space, it failed with kernel oops.
> It seems the code:
> BUG_ON(is_ioat_bug(chanerr));
> in drivers/dma/ioat/dma_v3.c, line 365 cause the oops.
> Is there anyway to access pci MMIO space using ioat?
> The datasheet says that ioat supports MMIO access.
Did you map the IO memory in kernel using ioremap and friends first?

-- 
~Vinod

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