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

[ååæ]

> > 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?
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.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/