linux-kernel - Re: [Pkg-xen-devel] ioatdma: Boot process hangs then reboots when using Xen + Linux 3.2

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Date:	Fri, 2 Mar 2012 21:08:26 +0100
From:	Bastian Blank <waldi@...ian.org>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Jonathan Nieder <jrnieder@...il.com>,
	xen-devel@...ts.xensource.com,
	pkg-xen-devel@...ts.alioth.debian.org,
	Maciej Sosnowski <maciej.sosnowski@...el.com>,
	linux-kernel@...r.kernel.org, William Dauchy <wdauchy@...il.com>,
	Konrad Rzeszutek Wilk <konrad@...nok.org>,
	Dave Jiang <dave.jiang@...el.com>
Subject: Re: [Pkg-xen-devel] ioatdma: Boot process hangs then reboots when
 using Xen + Linux 3.2

On Fri, Mar 02, 2012 at 11:31:56AM -0800, Dan Williams wrote:
> On Fri, Mar 2, 2012 at 9:57 AM, Bastian Blank <waldi@...ian.org> wrote:
> > phys_complete (a 32 bit value) gets compared to struct
> > dma_async_tx_descriptor.phys, which is defined as dma_addr_t, a _64_ bit
> > value.
> The assumption is that the driver's control structures are not in high
> memory so all address values will only have 32-bits of valid data,

Can you back that up by some kernel documentation? There is a reason why
pci_alloc_pool uses dma_addr_t to store the address and _not_ unsigned
long. This are physical addresses, nothing the kernel can access
directly without a mapping.

>                                                                    but
> maybe xen32 changes that assumption?

Xen changes a lot of things in the memory management. This includes that
physical != machine addresses, where i915 failed horrible.

> Can you send the log of the driver load with debug enabled?

No, I don't have that hardware.

Bastian

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