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

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Message-ID: <1304316260.1589.2.camel@vkoul-udesk3>
Date:	Mon, 02 May 2011 11:34:20 +0530
From:	"Koul, Vinod" <vinod.koul@...el.com>
To:	康剑斌 <kjbmail@...il.com>
Cc:	linux-kernel@...r.kernel.org, dan.j.williams@...el.com
Subject: Re: Can I/OAT DMA engineer access PCI MMIO space

On Fri, 2011-04-29 at 18:13 +0800, 康剑斌 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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